Considering there are 15 pool balls, (b), in the game of pool, and given a radius, (r). What is the volume, (V), of a rack in the game of pool?
You need to fix some issues: you only have one test working, you are rounding to 3 decimal places, and the last test case is false (it should give 502.655)
also you shouldn't use isequal when you use pi.
Getting the absolute index from a matrix
Generate a vector like 1,2,2,3,3,3,4,4,4,4
construct matrix with identical rows
Replace every 3rd element in a vector with 4
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